Patents by Inventor John E. Cranch

John E. Cranch has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pretransfer conditioning for electrostatic printing
    Patent number: 3984182
    Abstract: An electrostatographic machine is provided with an A.C. corona discharge device having a D.C. bias impressed thereon which is applied to the photoconductive surface prior to the passage thereof through an image transfer zone, the A.C. charge being such as to aid both transfer efficiency and background suppression while the D.C. bias further enhances the efficiency of background removal.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: October 5, 1976
    Assignee: Xerox Corporation
    Inventors: Robert W. Gundlach, John E. Cranch